0 axes note since 4 node infin110 elements are used

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Unformatted text preview: -frequency Analysis (ANTYPE = 2) Element Type(s): Elastic Straight Pipe Elements (PIPE16) Structural Mass Elements (MASS21) Input Listing: vm48.dat Test Case A small generator of mass m is driven off a main engine through a solid steel shaft of diameter d. If the polar moment of inertia of the generator rotor is J, determine the natural frequency f in torsion. Assume that the engine is large compared to the rotor so that the engine end of the shaft may be assumed to be fixed. Neglect the mass of the shaft also. Figure 48.1 Motor-Generator Problem Sketch Material Properties E = 31.2 x 106 psi m = 1 lb-sec2/in Geometric Properties d = .375 in = 8.00 in J = .031 lb-in-sec2 ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–114 VM48 Analysis Assumptions and Modeling Notes One rotational master degree of freedom is selected at the mass. The wall thickness of the pipe is defined as half the diameter to obtain a solid cross-section. Results Comparison Target f, Hz ANSYS Ratio 48.781 48.78...
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This note was uploaded on 12/09/2010 for the course DEPARTMENT E301 taught by Professor Kulasinghe during the Spring '09 term at University of Peradeniya.

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